From d5b866e2421786a661448a41fb6dfb7fe2457f53 Mon Sep 17 00:00:00 2001
From: Sergiu Deitsch <sergiud@users.noreply.github.com>
Date: Mon, 3 Feb 2025 17:51:58 +0100
Subject: [PATCH] fix gcc 8.3 compile errors (#4336)

---
 include/fmt/base.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/fmt/base.h b/include/fmt/base.h
index 551a6b86..8fdcea7c 100644
--- a/include/fmt/base.h
+++ b/include/fmt/base.h
@@ -2263,8 +2263,8 @@ template <> struct is_output_iterator<appender, char> : std::true_type {};
 template <typename It, typename T>
 struct is_output_iterator<
     It, T,
-    void_t<decltype(*std::declval<decay_t<It>&>()++ = std::declval<T>())>>
-    : std::true_type {};
+    enable_if_t<std::is_assignable<decltype(*std::declval<decay_t<It>&>()++),
+                                   T>::value>> : std::true_type {};
 
 #ifndef FMT_USE_LOCALE
 #  define FMT_USE_LOCALE (FMT_OPTIMIZE_SIZE <= 1)